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--- On Thu, 2/7/13, Goran Finnberg <[log in to unmask]> wrote:

> 
> http://en.wikipedia.org/wiki/Passive_radiator_(speaker)
> 

> " The weight of the cone of the passive radiator
> should be approximately equivalent to the mass of
> the air that would have filled the port which might
> have been used for that design. "


OK, THAT makes sense!  I never got the impression that
the passive cone was anything but a duplicate of the
cone on the woofer.